Like many people who owns a MacBook Pro (or any Mac) I upgraded my system with a brand new OS: MacOS X Lion...
then I wondered if anything actually happen. No, I am not disappointed because this Â£21 brought me OpenGL 3.2 core support on my good old MacBook 13" I carry everywhere.

It seems that Apple decided to make a clean cut on legacy providing two OpenGL implementations.
One is the old OpenGL 2.1 for compatibility with legacy software and one which is the OpenGL 3.2 core profile but the OpenGL 3.2 compatibility profile isn't supported.

UPDATE: I previously wrote that AMD OpenGL drivers didn't support the compatibility profile which is a mistake.
When creating a default contect, this context will be an OpenGL 4.1 compability profile implementation.

The cut is clean because the legacy features are not only removed from the core profile, there are also removed from the set of extensions exposed by the drivers.

This is really few extensions so we could wonder if the cut isn't a bit too clean. Looking at it maybe some extensions dependency haven't been considered.
For example, EXT_texture_sRGB is an extension part of OpenGL 2.1 core specification
but only partially because this extension has a dependency on EXT_texture_compression_s3tc.
Because of the S3 patent issue here, EXT_texture_compression_s3tc is not part of the OpenGL code specification neither can be dependent features.
If EXT_texture_sRGB is not available then we might not have sRGB support for S3TC texture formats.
However, I have no doubt that in fact sRGB on S3TC texture formats is actually supported.

Finally, for people who were surprized that Apple brought back Intel Chips in their hardware: You were right!
As the OpenGL Capability Matrix shows,
the OpenGL 3.2 implementation is not supported on Intel HD 3000 platform like the brand new MacBook Air and MacBook Pro 13".